diff --git a/xvaga/oswin32.cpp b/xvaga/oswin32.cpp
index 438535cc3..4a7bbef4e 100755
--- a/xvaga/oswin32.cpp
+++ b/xvaga/oswin32.cpp
@@ -199,16 +199,31 @@ void* OsWin32_GetPrinterInfo(int& size, const char* printer)
 	return pdm;
 }
 
-void OsWin32_SetCaptionStyle(WXHWND handle, bool set)
+void OsWin32_SetCaptionStyle(WXHWND handle, long style)
 {
-	HWND hwnd = (HWND)handle;
-	DWORD s = ::GetWindowLong(hwnd, GWL_STYLE);
-	if (set)
+	HWND hWnd = (HWND)handle;
+	LONG s = ::GetWindowLong(hWnd, GWL_STYLE);
+	
+  if (style & wxSYSTEM_MENU)
 	  s |= WS_CAPTION;
 	else
 	  s &= ~WS_CAPTION;
+
+  if (style & wxCLOSE_BOX)
+	  s |= WS_SYSMENU;
+	else
+	  s &= ~WS_SYSMENU;
+
   s |= WS_CLIPSIBLINGS; // Forzatura necessaria da wx261
-	::SetWindowLong(hwnd, GWL_STYLE, s);
+	::SetWindowLong(hWnd, GWL_STYLE, s);
+
+  if (style & wxCLOSE_BOX)
+  {
+    HMENU hMenu = ::GetSystemMenu(hWnd, FALSE);
+    ::EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | MF_ENABLED);
+    HICON hIcon = ::ExtractIcon(NULL, "res/campo.ico", 0);
+    ::SendMessage(hWnd, WM_SETICON, ICON_SMALL, (LPARAM)hIcon);
+  }
 }
 
 ///////////////////////////////////////////////////////////
diff --git a/xvaga/oswin32.h b/xvaga/oswin32.h
index 62baf4c8a..8aac47ad8 100755
--- a/xvaga/oswin32.h
+++ b/xvaga/oswin32.h
@@ -12,7 +12,7 @@ unsigned int OsWin32_LoadIcon(const char* file);
 
 int OsWin32_EnumerateFamilies(WXHDC hDC, char** families, int max_count);
 int OsWin32_EnumerateSizes(WXHDC hDC, const char* name, long* sizes, short* scalable, int max_count);
-void OsWin32_SetCaptionStyle(WXHWND handle, bool set);
+void OsWin32_SetCaptionStyle(WXHWND handle, long style);
 void* OsWin32_GetPrinterInfo(int& size, const char* printer);
 
 void OsWin32_PlaceProcessInWindow(unsigned int instance, const char* name, unsigned int parent);
diff --git a/xvaga/xvaga.cpp b/xvaga/xvaga.cpp
index 1d75e7714..08fcb9435 100755
--- a/xvaga/xvaga.cpp
+++ b/xvaga/xvaga.cpp
@@ -4158,7 +4158,7 @@ RCT* xvt_vobj_get_outer_rect(WINDOW win, RCT *rctp)
 	return rctp;
 }
 
-XVT_PALETTE xvt_vobj_get_palet(WINDOW win)
+XVT_PALETTE xvt_vobj_get_palet(WINDOW WXUNUSED(win))
 { return NULL; }
 
 WINDOW xvt_vobj_get_parent(WINDOW win)
@@ -4208,9 +4208,9 @@ BOOLEAN xvt_vobj_is_focusable(WINDOW win)
 
 void xvt_vobj_maximize(WINDOW win)
 {
-  wxFrame* pMain = wxDynamicCast((wxObject*)win, wxFrame);
-  if (pMain != NULL)
-    pMain->Maximize();
+  XVT_ASSERT(win != NULL_WIN && _task_win != NULL);
+  if (win == TASK_WIN)
+    _task_win->Maximize();
   else
   {
     CAST_WIN(win, w);
@@ -4312,7 +4312,7 @@ WINDOW xvt_win_create(WIN_TYPE wtype, const RCT* rct_p, const char* title, int m
   const wxRect rct = NormalizeRCT(rct_p);
 	const wxString caption = title;
 
-  long style = wxCLIP_CHILDREN | wxCLIP_SIBLINGS | wxWANTS_CHARS;
+  long style = wxCLIP_SIBLINGS | wxCLIP_CHILDREN | wxWANTS_CHARS;
 	if (win_flags & WSF_VSCROLL)
 		style |= wxVSCROLL;
 	if (win_flags & WSF_HSCROLL)
@@ -4324,6 +4324,8 @@ WINDOW xvt_win_create(WIN_TYPE wtype, const RCT* rct_p, const char* title, int m
 	case W_DOC:
 		if (!caption.IsEmpty())
   		style |= wxSYSTEM_MENU;
+    if (win_flags & WSF_CLOSE)
+      style |= wxSYSTEM_MENU | wxCLOSE_BOX;
 		break;
 	case W_PLAIN:
 		// style |= wxBORDER;  // Non attivare MAI il bordo!
@@ -4342,9 +4344,9 @@ WINDOW xvt_win_create(WIN_TYPE wtype, const RCT* rct_p, const char* title, int m
   w->SetBackgroundStyle(wxBG_STYLE_CUSTOM); // Lo sfondo viene disegnato nella OnPaint
 
 #ifdef WIN32
-  OsWin32_SetCaptionStyle(w->GetHWND(), wtype == W_DOC);
+  OsWin32_SetCaptionStyle(w->GetHWND(), style);
 #else
-  OsLinux_SetCaptionStyle((wxWindow*)w, style);
+  OsLinux_SetCaptionStyle(w, style);
 #endif
 
   if (menu_rid > 0 && menu_rid != 8000)     // 8000 = NULL_MENU_RID
diff --git a/xvaga/xvtwin.cpp b/xvaga/xvtwin.cpp
index 2f1d604d9..c07f58bcf 100755
--- a/xvaga/xvtwin.cpp
+++ b/xvaga/xvtwin.cpp
@@ -468,13 +468,33 @@ bool TDCMapper::HasValidDC(WINDOW owner) const
 
 IMPLEMENT_DYNAMIC_CLASS(TwxWindowBase, wxWindow)
 
+#ifdef WIN32
+WXLRESULT TwxWindowBase::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
+{
+  WXLRESULT rc = 0;
+  bool processed = false;
+
+  switch (nMsg)
+  {
+  case WM_CLOSE: 
+    processed = !Close(); 
+    break;
+  default: 
+    break;
+  }
+
+  if ( !processed )
+    rc = wxWindow::MSWWindowProc(nMsg, wParam, lParam);
+
+  return rc;
+}
+#endif
+
 bool TwxWindowBase::CreateBase(wxWindow *parent, wxWindowID id, const wxString &title,
 		    								       const wxPoint &pos, const wxSize &size, long style)
 {
-  // Evita inutili sfarfallamenti in quanto wxWidgets crea le finestre visibili per default
-  wxWindowBase::Show(false);  
-  bool ok = Create(parent, id, pos, size, style, title);
-  return ok;
+  wxWindowBase::Show(false);  // Evita inutili sfarfallamenti
+  return Create(parent, id, pos, size, style, title);
 }
 
 TwxWindowBase::TwxWindowBase(wxWindow *parent, wxWindowID id, const wxString &title,
diff --git a/xvaga/xvtwin.h b/xvaga/xvtwin.h
index 14a5d81e6..d172e6b26 100755
--- a/xvaga/xvtwin.h
+++ b/xvaga/xvtwin.h
@@ -118,6 +118,10 @@ private:
   virtual wxString GetTitle() const { return m_strTitle; }
 #endif
 
+#ifdef WIN32
+  virtual WXLRESULT MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam);
+#endif
+
 public:
   bool CreateBase(wxWindow *parent, wxWindowID id, const wxString &title,
 		    		      const wxPoint &pos, const wxSize &size, long style);
@@ -125,7 +129,6 @@ public:
   TwxWindowBase() { }
 	TwxWindowBase(wxWindow *parent, wxWindowID id, const wxString &title,
 	  	          const wxPoint & pos, const wxSize & size, long style);
-  virtual ~TwxWindowBase() { }
   DECLARE_DYNAMIC_CLASS(TwxWindowBase)
 };